#include <bits/stdc++.h>
using namespace std;
int s,n,l;
int main()
{
    char c;
    while (cin >> c)
    {
        if (c >= '0' && c <= '9')
        {
            s -= n;
            s++;
            n = 1;
        }
        else
        {
            n = 0;
        }
    }
    cout << s;
}